Permatron Fanguard
PreVent® Washable Fan Guard Air Filter
Price:Contact us for a quote

Permatron Prevent washable fan guard air filter for mobile and pedestal air circulator fan. Bonnet style filter screen with elastic edging is available for the back side of any sized round fan guard to keep dust from being drawn in and recirculated throughout a facility as the fan blows. The filter opens and closes with hook/loop closure, finished with an elastic edge and cut-out for easy installation. Fits snug around motor encasement.

  • Average Arrestance Efficiency: 42%
  • Initial Air Flow Resistance: 0.02" w.g.
  • Dust Holding Capacity: 67 grams
  • U/L Classified As to Flammability Only


Washable electrostatic filter media is available in white or black honeycomb woven polypropylene. Easy to clean media that is nonreactive to chemicals or corrosive environments. White media is FDA approved for food processing/AIB audit applications. Black media is UV protected for outdoor applications.

How to Measure a Prevent© Bonnet Filter

Prevent washable bonnet filters are available in 4 different styles. They are available in either black or white electrostatic polypropylene media, finished with an elastic edge. Made to fit any fan guard, ventilation exhaust opening, or air intake opening, the bonnets are manufactured to the EXACT size ordered, so measure carefully. Filters are not returnable.

Model BONNET – When measuring for fit over a fan guard grill, measure up and over the front half of the grill:
MOdel Bonnet how to measure
For price, round this measurement up to the next whole number and convert to sq inches.

Model FANGUARD – Measure for BONNET, as shown above. In addition, measure the motor diameter for the center cut‐out.
model fanguard how to measure

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